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The ACT same-sex marriage bill will be debated in the October sitting of the Legislative Assembly and is expected to pass with the support of government MLAs and Greens MLA Shane Rattenbury.

The ACT Liberals say they will vote against the bill because marriage is a federal matter.

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Mr Hinton called on the opposition to reconsider a conscience vote following the publication of the Tasmanian report.

"Last month ACT Liberals leader, Jeremy Hanson, spoke respectfully of the Canberrans who would be so directly and positively impacted by this law," he said.

"He also indicated that his party would be voting against the bill as a block due to constitutional concerns held at the time.

"We now ask Mr Hanson to allow his party members the opportunity of reviewing this report and voting freely and in good conscience."

The report says there is no way to predict which way the High Court would rule if same-sex marriage laws in Tasmania were challenged due to inconsistency with federal laws.

"None of the issues raised present an absolute impediment to achieving state-based or Commonwealth marriage equality," the report concludes.

The report says the Commonwealth is the most likely challenger to state or territory-based marriage equality laws.

It argues that the pool of individuals or lobby groups who could instigate a challenge is "limited, because it is likely that only those who are married under the same-sex marriage law would have standing to do so."

The report finds that while state-based same-sex marriage laws could be open to constitutional challenge this "does not need to be a barrier to legislative change."